Enhancements to the REX System and Updates to Data and Other Requirements Applicable to Requests for Extensions of Time Under Regulation T and SEA Rule 15c3-3

Effective Date: December 3, 2018 (enhancements to the REX System to provide firms the ability to submit Securities Exchange Act (SEA) Rule 15c3-3(d)(4) extension of time requests via a batch file process and other updates to the extension of time request forms); February 25, 2019 (updates to data and validation requirements for extension of time requests under Regulation T and SEA Rule 15c3-3)